Bit-holder.



' ing 'isa specification.

f UNITED sTATns PATENT OFFICE.

EDWARD J. ELsAs, or BLUE Mounn, MIssoU-Rn 'To all whom it may concern.'

Be it known that I, EnuaiiiLJ-i Risas, a citizen of'the United States, residing at Blue Mound, in' the county of 'Livingston and State of Missouri, have invei'ited a new andusefu-l .Bit-Holder', of which thc-follow-l i with a shoulder 12 and the said shoulder is This invention has relation to hit holders and consist'sgin the novel^coiislruction` hei-rbit .in propel". ,Gligagement with a socketed' 'inaft'er' describedshown and lclaimed.

"More particularly t-lie invention relates lo means for securely holdingA the shank of a holder during the/twisting strain while the b'it is being used for boring' purposes and to provide' such-means iiii- Vwhich friction y caused .byengaging and disengagiiig the' members is reduced tol a minimum and -in engage them isi eliminated.

i which the possibility-of tlievparts becoming or wedged 4together, to such an extent as to require hammering or knocking to :dis-

Furthermore the arts when connected to each ,other are In'the:accompanying drawings Figare tir y held and braced against the ltwisting strain and; do not' require tlie use of secuiu.

ingscrews orl nuts as are usually employed 1n similar devicesl at' the present time.

i 4 1 is s. side elevation of the upper portion of .the bit. Fig. 2 ,is a sectional view of part .of the holder. Fig. 3 is an enlarged perspectivevi'ew of part of the bit. Fig. 4i is a. transverse sectionaly view `of the bit ,and`

holderengaged. Fig, 5 is a transverse secs tional View of the bit on the line 5 5 of Fig. 3. Fig. 6 is a transverse sectional view of thebit-on the line (iL-.dof Fig. 3.v

' The device comprises a holder 1 having a concentricallypositioned socket 2 which 'is open at one end. The holder 1 is also pro-4 vided at its end and atA the side of the socket 2 with a recess 3 one wall Ltof which is radially disposed with relation to the axis of the holder 1 'and the wall 5 of which.

is spirally disposed with relation tothe axis of the holder 1.. The holder l carries a stop`6 which projects into4 the socket 2. of the said holder and the said stop is provided with a beveled end 7. A bit 8 is provided upon its shank with av longitudinally disposed peripheral groove 9'which terminates at itslower or inner end in a laterally disposed .branch 10 having its bottom wall 11 constitutin afcani. The socket 2 of the 4holder 1 is a apted to snugly receive the shank of the bit 8 and the stop 6 is adapted 'Brr-HOLDER;

'Specification of Letters Patent. Patented Angry 2.2, 1911, Application aiea'niiie 2a, 1909. serial No. 503,906. r i

to pass along the groove) in the shank off the bit 8 'andthe-beveled.end T tliereot' is adapted to-wedgc upon the caniv wall 11 of the groove branch 1() when the liit'is turned upon its axis with relation to the holder 1.`

The bit 8 is provided adjacent its' shank provided with a. lug 13 which is adapted t0 enter and lit snugly within the recess 3 at the endof the holder 1 when the bit is turned upon itsaxis with relationto the holder and the beveled end of the stop Gis-` wedged Aagz'iinst 'the cani wall 11 of' the groove branch 10. The groove branchjl in the shank of the bit .S'is enough longer-iin a direction longitudinally of 'the bit,- .than the thickness of the stop 6 in the same direction' s to permit t-lie engagement and dis'engage nient of the lug 13 and 'the recess 3. There.- fore it will be seen that when the shankof thebit 8 is inserted in the socketr 2 pro; vided in the bolder 1 and lthe parts are en-l gaged in position as hereinbe'fore indicated that 'the-twisting strain to whichthe bit 8 is subjected while it is used for boring purposes is in a great measure resisted by the lug 13 in engagement with the radially disposed wall 4t of the recess 3. -At the same time the end of the holder 1 is in close contact with the slioulder'12 and--thus tiie thrust strain `to which the bit 8 is subjected is borne by the end of the holder 1. Therefore the stop 6 is not subjected to any great extent to either strain and the frictional contact between thesaid stop and bottom of the groove branch 10 is merely enough to prevent the bit from having a tendency to turn -in the holder 1 when thebit 8'is turned in a direction opposite to that in which the bit is Iuriied when 'it is performing the boring operation. Therefore it will'be seen that undue friction between the stop 6 and the groove branch 10 is eliminated and hence these parts are not subjected to unnecessary wear and when it is desired to disconnect the bit- 8 from the holder 1 it is necessary only to pull the said bit in aA direction away from the end of the holder when the lug 13 will be moved away from the recess aiidl then the said bit is free to rotate in the holder. l until the stop G is brought into alinement with the lower or inner end of the A groove 9 when the said stopmay be moved along the saidgroove and the bit 8 is sep- -arated from the holder 1. Therefore it will be seen that in order to effect the separation 2 y A l1,001,376

A of the' parts it is not necessary to use force orto apply a Wrench or other, tool to the parts. Furthermore when the. parts are connected together in thema-.nner as indicated they are securely-retained in their 'proper relation by reason of the twist strain to which the bit is subjected during the bor-V i ing operationandconsequently the necessity of securing screws or nuts is overcome.

Havlng described the invention what I claim as' new and desire to secure by Letters Patent is The combination of a socketed holder liaving at one end and at the side of the socket a recess with one wall radially disposed with relation' to tlieaXis of theholder and an- :othenwall 'spirally disposed with relation to the axis of the holder, a fixed stop carried by the holder Aand projecting -fi'oin the side l20 thereof into the' socket and having a beveled gend, a, bit having its shank provided with a peripheral. groove longitudinally disposed andterminating at its inner end in a laterally disposed branch with its bottom wall 25 forming a cam, the socket of said holder adapted to snugly receive the shank of' the.'

bit'and the stop adapted to ass'along said groove and the beveled end-'tlliereof adapted to Wedge .upon the cm, when the bit is turned .upon its axis with relation to the holder, said bit having adjacent its shank. a shoulder provided with alug adapted to en- -t-er and s'nu ly fit within the recess at the end of' the iolder when the bit isM turned upon its vaxis with relation to the holder'and the beveled end of lt-he stop is wedged against the cam, the groove Ain the bit shank being enough' larger in a direction Ilongitudinally of the bit thanthe thickness of. the

stop inthe same direct-ion to permit the enl 

